Resistance Position Transducer:
In many industrial measurements and control applications, it is necessary to sense position of the object or the distance that object travels. For such applications, simple resi~tanceposition transducer is very useful.
It works on the principle that resistance of the sensing element changes due to the wiations in physical quantity being measured.
A simple resistance position transducer is as shown in the Fig.
The transducer consists a sliding contact or wiper. A resistive element is mounted with the sliding contact which is linked with the object whose position is to be monitored.
Depending upon the position of the object, the resistance between slider and the one end of resistive element varies. The equivalent circuit is as shown in the Fig. 8.18 (b). The output voltage Vout depends on the position of the wiper. Thus depending upon position of the wiper, the output
voltage is given by,
Thus You I is proportional to R2 i.e. wiper position. The output voltage is measured using voltmeter which is calibrated in centimeters and allows direct readout of the object position.
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